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PU nylon coated gloves industry elaborate for easy welding, we need to stick dust pad or sticky dust drum dust

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PU nylon coated gloves industry elaborate for easy welding, we need to stick dust pad or sticky dust drum dust

Date:2017-02-20 Author: Click:

PU nylon coated gloves industry elaborate for easy welding, we need to stick dust pad or sticky dust drum dust

 1, the use of hand soldering iron for welding, it is not difficult to master, but there must be some technical essentials. People who have long been engaged in the production of electronic products summed up the four elements of welding: materials, tools, methods, methods and operators.

2, the correct posture of the welding operation:

Master the correct operating posture, you can ensure that the operator's physical and mental health, reduce labor damage, in order to reduce the welding of heating when the volatile chemical substances on the human harm and reduce the amount of harmful gases inhalation, under normal circumstances, the iron to the nose Should not less than 20CM, usually 30CM is appropriate.

3, the basic steps of welding operations:

      (1), ready to apply welding; left hand to get welding wire, right hand holding iron, into the welding state. Requires the tip to keep clean, no residue and other oxides, and in the surface with a layer of solder.

      (2), heating the weldment; tip placed in the connection of two welding parts, heating the whole weldment, the time is about 1 to 2 seconds. For the printed parts on the printed circuit board, pay attention to the soldering iron at the same time contact the lead parts of the lead.

      (3), into the welding wire; welding of the welding surface is heated to a certain temperature, the solder wire from the opposite side of the soldering iron.

      (4), remove the wire; when the solder wire melts a certain amount, immediately to the left 450 direction to remove the solder wire.

      (5), remove the soldering iron; solder infiltration pad after welding parts, to the right of the 450 direction to remove the soldering iron, the end of welding. From the third step to the end of the fifth step, the time is about 1 to 3 seconds.

     4, the welding temperature and heating time appropriate temperature on the formation of a good solder joint is essential. After the test, the tip of the welding head on the time to stay with the weldment temperature is proportional to the relationship. The same soldering iron, heating different heat capacity of the weldment, want to achieve the same welding temperature, can be achieved by controlling the heating time. But in practice can not only rely on the relationship between the heating time. For example, with a small power soldering iron heating a large weldment, no matter how long the iron to stay, the temperature of the weldment is not up, because the soldering iron heating capacity is less than the weldment and soldering iron in the air lost heat. In addition, in order to prevent internal overheating damage, some components do not allow long-term heating, excessive heating, in addition to possible damage to components, there are the following hazards and external features:

(1) Poor solder joint appearance. If the solder has been infiltrated after welding the weld will continue to be excessive heating, will make all the volatile flux finished, resulting in hot melt overheating; when the soldering iron is easy to pull tin tip, while the solder surface white, coarse particles, loss of luster The

(2) high temperature caused by the decomposition of rosin flux decomposition. Rosin generally began to decompose at 210 ℃, not only lost the role of flux, but also caused by solder paste slag formation defects. If the rosin is found in the welding black, it is certainly the heating time is too long.

(3) Excessive heat will cause the adhesive layer of the copper foil on the printed circuit board, resulting in peeling off the copper foil pad. Therefore, in the appropriate heating time, an accurate grasp of the heating furnace is the key to high-quality welding.


PU nylon coated gloves

5, the specific operation of the welding operation

(1) Keep the tip clean.

(2) by increasing the contact area of fast heat transfer.

(3) heating depends on the solder bridge

(4) iron withdrawal has to pay attention

(5) the amount of solder to be moderate

Components of the bending need to use the formation of dust pad or dust dust drum dust

(1) bending of components In order to make the assembly of components in the printed circuit board layout and easy to weld, we need to dust dust dust, before installation, usually by hand or special machinery to lead the components of the lead to a certain shape The In order to avoid damage to components, components, plastic surgery should pay attention to the following points:

    1, the minimum radius of the wire bend should not be less than 2 times the diameter of the lead, can not "kill the corner";

    2, the lead bending at the distance between the components at least 2mm or more, absolutely not from the root of the lead began to bend. For those easily broken glass packaging components, lead forming need to use dust drum dust.

    3, shear forming the components must pay attention to the appearance must be beautiful, do not have burrs, if necessary, need to use sticky dust drum or dust pad dust

  (2) components of the plug-in components installed to the printed circuit board, whether it is horizontal or vertical installation, these two methods should make the components of the lead as short as possible. In the single-sided PCB on the horizontal assembly, the low-power components are always parallel to the board surface; in the double panel, the components can be left from the board about 1-2mm, to avoid heat due to components and reduce copper Foil to the substrate adhesion, and to prevent the exposed parts of the components with the printed wire short circuit. When installing components should pay attention to the following principles:

   1, the assembly should be installed before those who need mechanical fixed components, such as power devices, radiators, brackets, clips, etc., and then install the welding by fixed components. Otherwise, it will be in the mechanical fastening, so that the printed circuit board and the damage caused by other components.

   2, the installation of various components, should make their mark (with color code or character marked with the value, accuracy, etc.) toward the left and down, and pay attention to the direction of marking the same (from left to right); horizontal installation Of the components, as far as possible so that both ends of the length of the same symmetrical lead, components placed in the middle of the two holes, arranged to be neat. The polarity of the components to ensure the correct direction.

   3, components in the printed circuit board on the vertical installation, the unit area to accommodate more components, suitable for the smaller space inside the chassis, compact components of the compact products. But the mechanical properties of vertical assembly is poor, anti-vibration ability is weak, if the components tilt, it is possible to contact the adjacent components caused by short circuit.


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